MJ
Mary Jefferson — 1940 US Census Record
Linked across censuses1940 United States Federal Census · District-Of-Columbia-County, District of Columbia
Our Model Tree links this Mary Jefferson across the 1930 and 1940 US Censuses in District-Of-Columbia-County, District of Columbia (XGBoost, ~Confirmed) — first a daughter (b.~1922), then head of a 13-person household.
Age 18
b. ~1922
Female
Daughter
Born: South Carolina
Single
1940 Census Record Details
| Census Year | 1940 |
| Location | District-Of-Columbia-County, District of Columbia |
| Surname | Jefferson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 18 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Washington |
| 1935 Residence (County) | District Of Columbia |
| Additional Details | |
| Occupation | Domestic |
| Industry | Private home |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
| Occupation | Domestic |
| Township / Ward | Washington |
| Est. Birth Year | ~1922 |
Household Members
Census records only state relationship to the household head.
Pairwise kinship is derived (~90–95% accurate), not recorded.
Step/blended families and boarders can break it.
13 people recorded at the same address in the 1940 census.
| Name | Relation to head | Relative to Mary | Age | Birth yr |
|---|---|---|---|---|
| Lula Jefferson | Spouse | — | 47 | ~1893 |
| Henry Jefferson | Son | — | 17 | ~1923 |
| Yvonne Fuller | Other | — | 1 | ~1939 |
| Mary Jefferson | Daughter | — | 18 | ~1922 |
| Helen Jefferson | Daughter | — | 15 | ~1925 |
| Willie Mackin | Daughter | — | 25 | ~1915 |
| Fletcher Jefferson | Son | — | 21 | ~1919 |
| William Fuller | Other | — | 22 | ~1918 |
| Alice Fuller | Other | — | 23 | ~1917 |
| Elizabeth Jefferson | Daughter | — | 10 | ~1930 |
| Lloyd Jefferson | Head | — | 49 | ~1891 |
| Marcella Jefferson | Daughter | — | 13 | ~1927 |
| Thelma Mackin | Other | — | 7 | ~1933 |
Census Appearances
1930
District Of …
Daughter, age 8
District Of Columbia, District of Columbia · implied b. ~1922 — 13 household members
●
Primary link
· ~Confirmed · 2 sources
XGBoost
Household
| Surname | Jefferson |
| Given Name | May |
| Relationship to Head | daughter |
| Sex | F |
| Color / Race | Black |
| Age | 8 |
| Marital Status | Single |
| Birthplace | South Carolina |
| Father's Birthplace | North Carolina |
| Mother's Birthplace | South Carolina |
| Occupation | none |
| Can Read/Write | Yes |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
1940
District-Of-Columbia-County, District …
Daughter, age 18
District-Of-Columbia-County, District of Columbia · implied b. ~1922 — 13 household members
| Surname | Jefferson |
| Given Name | Mary |
| Relationship to Head | Daughter |
| Sex | F |
| Color / Race | Black |
| Age | 18 |
| Marital Status | Single |
| Birthplace | South Carolina |
| 1935 Residence (City) | Washington |
| 1935 Residence (County) | District Of Columbia |
| Occupation | Domestic |
| Industry | Private home |
| Class of Worker | PW |
| Hours Worked | 12 |
| Income (1939) | 0 |
| Highest Grade | No 7 |
| 1935 Residence | Same place |
| Birth State | South Carolina |
| Birth Country | United States |
| Birthplace (normalized) | south carolina |
Model Tree
An inferred pedigree reconstructed from census links — up to 4 generations within the 1900–1950 window. Closer generations are built from household co-residence; deeper ones are bridged by following a relative to their own childhood census. Confidence compounds and weakens with each generation.
Our Model Tree links Mary Jefferson across 2 US Census years (1930 and 1940) in 2 locations, using XGBoost record linkage.
Show:
This person
Anchor record
Mary Jefferson
Daughter · 1940 · age 18 · b. ~1922 · District of Columbia
★ You are viewing this record
Sibling
Henry Jefferson
Sibling · 1940 · age 17
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Helen Jefferson
Sibling · 1940 · age 15
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Willie Mackin
Sibling · 1940 · age 25
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Fletcher Jefferson
Sibling · 1940 · age 21
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Marcella Jefferson
Sibling · 1940 · age 13
Source co-child of head (derived)
● Co-child · derived · ~0.88
Sibling
Elizabeth Jefferson
Sibling · 1940 · age 10
Source co-child of head (derived)
● Co-child · derived · ~0.88
Confirmed / household (~0.90+)
Probable / derived (~0.65–0.89)
Candidate (<0.65, unverified)
Original Census Page
1940 US Federal Census — District-Of-Columbia-County, District of Columbia
Open full size
1940 US Federal Census — District-Of-Columbia-County, District of Columbia
Page Contents
40 people indexed on this census page (nara:1940:m-t0627-00555-00746)
| Line | Name | Age | Relation | Occupation | Birthplace |
|---|---|---|---|---|---|
| 41 | Albert Anderson | 49 | Head | Service Court Cook | South Carolina |
| 42 | Sarah Anderson | 47 | Wife | — | South Carolina |
| 43 | Davidson Anderson | 34 | Brother | Cook | South Carolina |
| 44 | Beatrice Mingo | 32 | Head | — | South Carolina |
| 45 | Mack Mingo | 42 | Lodger | Laborer | South Carolina |
| 46 | Lula Mingo | 26 | Lodger | Domestic | South Carolina |
| 47 | Langston Mingo | 23 | Lodger | Maid | South Carolina |
| 48 | Sankcho Pimble | 39 | Head | Janitor | South Carolina |
| 49 | Minnie Pimble | 35 | Wife | Domestic | South Carolina |
| 50 | Louisa Pimble | 17 | Daughter | Domestic | South Carolina |
| 51 | Marion Pimble | 15 | Daughter | — | D.C. |
| 52 | Hattiebell Pimble | 12 | Daughter | — | D.C. |
| 53 | Geneva Pimble | 10 | Daughter | — | D.C. |
| 54 | Minnie M. Pimble | 7 | Daughter | — | D.C. |
| 55 | Sankcho Jr. Pimble | 3 | Son | — | D.C. |
| 56 | Nettie Greeley | 29 | Sister in law | — | South Carolina |
| 57 | Leroy Greeley | 4 | Nephew | — | D.C. |
| 58 | Lloyd Jefferson | 49 | Head | Head Carrier | South Carolina |
| 59 | Lula Jefferson | 47 | Wife | Laundress | South Carolina |
| 60 | Fletcher Jefferson | 21 | Son | Attendant | South Carolina |
| 61 | Mary Jefferson THIS PERSON | 18 | Daughter | Domestic | South Carolina |
| 62 | Henry Jefferson | 17 | Son | Carrier | South Carolina |
| 63 | Helen Jefferson | 15 | Daughter | — | South Carolina |
| 64 | Marcella Jefferson | 13 | Daughter | — | South Carolina |
| 65 | Elizabeth Jefferson | 10 | Daughter | — | D.C. |
| 66 | Willie Mackin | 25 | Daughter | — | South Carolina |
| 67 | Thelma Mackin | 7 | Niece | — | D.C. |
| 68 | William Fuller | 22 | Lodger | Truck Driver | South Carolina |
| 69 | Alice Fuller | 23 | Lodger | — | South Carolina |
| 70 | Yvonne Fuller | 1 | Lodger | — | D.C. |
| 71 | Leroy Williams | 41 | Head | Laborer | Florida |
| 72 | Etta Williams | 29 | Wife | Domestic | D.C. |
| 73 | Joseph Thornton | 56 | Head | Shipping Clerk | Virginia |
| 74 | Raymond Thornton | 32 | Son | Laborer | Maryland |
| 75 | Vernon Thornton | 25 | Son | Janitor | D.C. |
| 76 | William Thornton | 17 | Son | New Worker | D.C. |
| 77 | Louise Thornton | 16 | Daughter | New Worker | D.C. |
| 78 | Phyllis Thornton | 13 | Daughter | — | D.C. |
| 79 | Norman Thornton | 12 | Son | — | D.C. |
| 80 | Joseph Thornton | 10 | Son | — | D.C. |
About This Record & Model Tree
This record was independently indexed by YourRoots from the 1940 United States Federal Census (NARA). Our Model Tree links this person across census decades using XGBoost-based record linkage, with per-link confidence scores. Household corroboration strengthens the signal when co-residents appear on the same census pages in multiple years.
Source: National Archives and Records Administration (NARA)